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CLEARWXTER <br /> } G R O U P, [ N C <br /> 4.2 Groundwater Sample Analytical Results <br /> 1 <br /> Low to moderate concentrations of TPHg were detected in samples collected fromall <br /> all <br /> monitoring wells except MW-4 Lab analysis of the sample collected from MW-2 <br /> ' indicated the presence of 38,000 ppb of TPHg Benzene was' detected in all wells <br /> except MW-4 with a maximum concentration of 700 ppb also detected in MW-2 A <br /> summary of groundwater elevations and analytical results is presented on Table 1 <br /> ' Hydrocarbon concentrations are displayed graphically on Figure 4 A copy of the <br /> laboratory reports and chain-of-custody forms are attached in Appendix B <br /> 5.0 RECOMMENDATIONS <br /> Based on the results of the three quarters of groundwater monitoring that have <br /> ' followed the installation of MW-4 and MW-5, it is apparent that active/remedial <br /> action may be required in order to lower concentrations of dissolved hydrocarbons <br /> in groundwater to agency-acceptable levels It is also apparent that the <br /> down radient extent of hydrocarbon contamination (northwest of MW-5) has not <br /> �s been defined <br /> a <br /> As recommended in, the February 15, 1995 Quarterly Sampling Report, one <br /> additional downgradient monitoring well, two vapor extraction wells, and two air I <br /> sparge wells will be, installed by mid-July Pilot testing will take place shortly <br /> thereafter rp <br /> , 'This next phase I of wrork has been re-approved by, the Underground <br /> I <br /> Storage Tank'Cleanup Fund n I V. <br /> I <br /> I I <br /> s n <br /> I ' <br /> Ir i <br /> II l I j j 14 Er r I k i 1 <br /> I rt'� <br /> 1 I � S I I HI r r 6 E 4 n� III d i e•Ii r <br /> 311, <br /> � <br /> I1-`101`l� 4I ' <br /> rl <br /> Q4 <br /> ' <br /> ` E tcl r <br /> !I`I�I <br /> ltl �, r'h deer , I I C qrI r .I+I Irl r I t t ii 11 qn l .I tai�rlr l I v All. t ,�r :'I, I l t^I v r nE <br /> k' <br />